科研之友
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摘要
Vacuum ultraviolet (VUV) phosphors are indispensable material to the development of a new generation white-LED, visual display and etc. Searching an ideal host of phosphors from NLO materials is one of effective approaches. Employing excellent NLO crystal beta-BaB2O4 (beta-BBO) as matrix material, we have synthesized lanthanide ions (Eu3+ or Tb3+)-doped b-BBO phosphors by solid-state reaction, and have investigated their luminescent properties, the optimal doping amount of RE3+ (Eu3+ and Tb3+) by ultraviolet wave excitation, decay curves and lifetimes, respectively. For red phosphor, the measured dominating emission peak (610 nm) was attributed to D-5(0)-> F-7(2) transition of Eu3+. For green phosphor, beta-BBO:Tb3+ emits bright green at 542 nm with 278 nm excited light. The concentration quenching curve showed that the optimal concentration of Eu3+ and Tb3+ in beta-BBO were about 22.00 mol% and 10.00 mol % (theoretical value), corresponding to the effective value of 20.60 mol% and 9.20 mol% measured by ICP, respectively. The variety of lattice parameters of beta-BBO:RE3+ (RE3+ = Eu3+, Tb3+), by contrast to beta-BBO, has been calculated according to the XRD data. The luminescence mechanism of RE3+-doped beta-BBO (Eu3+ and Tb3+) were analyzed. Chromaticity coordinates, color temperature of beta-BBO:RE3+ (Eu3+ and Tb3+) were also calculated separately according to the emission spectra, the value of CIE coordinates indicated that the synthesized phosphors have good color purity. The impact of flux-grown synthetic method on the luminescence intensity of as-prepared beta-BBO:RE3+ (RE3+ = Eu3+, Tb3+) was also investigated.
